Here is a fidget I recently made for my son with ADHD. I designed this one because good R188 bearings are almost completely silent. So he can fidget with it to his hearts content and it does not disturb those around him. This is not the case with standard 608 skate bearing fidgets which can have a loud rolling noise.

I have included STL, STEP, and a link to the native Onshape file below. It is made in a 5/16" nut (½" between flats) and 8mm nut (13mm between flats, DIN 934) counterweight versions.

Onshape: https://cad.onshape.com/documents/b693ce7de0f8a3c18047cd3b/w/4fbcb1d2933ca46f34b0746c/e/5f344a84d195b39368d10a07?renderMode=0&uiState=6562178f6452f42a0d040cf5

Nuts and bearings should press in without too much trouble on a tuned printer. And if the counterweight nuts cause problems use a bolt and washer from the back side to pull them in.

Bearings I Used: https://www.amazon.com/dp/B095GTJC1R